如何使用数组在 FilterExpression 中使用“IN"语句

本文介绍了如何使用数组在 FilterExpression 中使用“IN"语句 - dynamodb的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

检查了 AWS 文档，但没有找到任何工作示例.

Checked AWS document but did not find any working example.

这是我的尝试

var params = { TableName: "User", IndexName:"a-b-index", KeyConditionExpression: "Country = :country and #s = :status", FilterExpression: "Id IN (:e)", ExpressionAttributeValues: { ":country ": "USA", ":status": 1, ":e": "1" }, ExpressionAttributeNames: {"#s": "Status"} }; //get users dynamodb.query(params, function (err, data) { if (err) //error else { //success } });

有记录，但它正在获取 ID 为 1 的记录，但我想使用这样的数组

Got records but it is fetching record which have id 1 but i want to use array like this

var params = { TableName: "User", IndexName:"a-b-index", KeyConditionExpression: "Country = :country and #s = :status", FilterExpression: "Id IN (:e)", ExpressionAttributeValues: { ":country ": "USA", ":status": 1, ":e": ["1","2","3"] }, ExpressionAttributeNames: {"#s": "Status"} }; //get users dynamodb.query(params, function (err, data) { if (err) //error else { //success } });

如何使上面的代码有效.想要获取记录.语法正确，查询运行没有错误，但我没有得到记录

How can make above code as working.want to get records. syntax is correct and query run without error but i am not getting records

推荐答案

请参考这个答案

总结:-

对于IN"子句中固定数量的值:-

var params = { TableName : "Users", FilterExpression : "username IN (:user1, :user2)", ExpressionAttributeValues : { ":user1" : "john", ":user2" : "mike" } };

对于数组中的更多元素并动态形成FilterExpression:-

var titleValues = ["The Big New Movie 2012", "The Big New Movie"]; var titleObject = {}; var index = 0; titleValues.forEach(function(value) { index++; var titleKey = ":titlevalue"+index; titleObject[titleKey.toString()] = value; }); var params = { TableName : "Movies", FilterExpression : "title IN ("+Object.keys(titleObject).toString()+ ")", ExpressionAttributeValues : titleObject };